Thomas Duane Arnold is an American actor, still probably best known to older TV viewers as Roseanne Barr's ex-husband, although they have been divorced for two decades, and he has subsequently married three more times. He has over 140 acting credits, including films like True Lies and Exit Wounds, and TV shows such as Sons of Anarchy, ER, Hot in Cleveland and Hawaii Five-0. He portrayed Garth Mathers on the USA Network hit series Psych.